#include"Date.h"

bool Date::CheckDate()const
{
	if (_month < 1 || _month>12 || _day<1 || _day>GetMonthDay(_year, _month))
	{
		return false;
	}
	else
	{
		return true;
	}
}

Date::Date(int year, int month, int day)
	:_year(year)
	,_month(month)
	,_day(day)
{
	if (!CheckDate())
	{
		cout << "false try again";
	}
}

void Date::Print() const
{
	cout << _year << ' ' << _month << ' ' << _day << endl;
}

bool Date::operator>(const Date& d) const
{
	if (_year > d._year)
	{
		return true;
	}
	else if (_year == d._year && _month > d._month)
	{
		return true;
	}
	else if (_year == d._year && _month == d._month)
	{
		return _day > d._day;
	}

	return false;
}

bool Date::operator<(const Date& d) const
{
	return !(*this > d) && !(*this == d);
}

bool Date::operator<=(const Date& d) const
{
	return !(*this > d);
}

bool Date::operator>=(const Date& d) const
{
	return !(*this < d);
}

bool Date::operator==(const Date& d) const
{
	return _year == d._year
		&& _month == d._month
		&& _day == d._day;
}

bool Date::operator!=(const Date& d) const
{
	return !(*this == d);
}

Date& Date::operator+=(int day)
{
	if (day < 0)
	{
		return *this -= (-day);
	}
	_day += day;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		++_month;
		if (_month == 13)
		{
			++_year;
			_month = 1;
		}
	}
	return *this;
}

Date Date::operator + (int day)const
{
	Date tmp(*this);
	tmp += day;
	return tmp;
}

Date& Date::operator-=(int day)
{
	if (day < 0)
	{
		return *this += (-day);
	}
	_day -= day;
	while (_day <= 0)
	{
		--_month;
		if (_month == 0)
		{
			_year--;
			_month = 12;
		}
		_day += GetMonthDay(_year, _month);
	}
	return *this;
}

Date Date::operator-(int day)const
{
	Date tmp(*this);
	tmp -= day;
	return tmp;
}

Date& Date::operator++()
{
	*this += 1;
	return *this;
}

Date Date::operator++(int)const
{
	Date tmp(*this);
	tmp += 1;
	return tmp;
}

Date& Date::operator--()
{
	*this -= 1;
	return *this;
}

Date Date::operator--(int)const
{
	Date tmp(*this);
	tmp -= 1;
	return tmp;
}

int Date::operator-(const Date& d) const
{
	int flag = 1;
	Date max = *this;
	Date min = d;
	if (*this < d)
	{
		max = d;
		min = *this;
		flag = -1;
	}
	int n = 0;
	while (min != max)
	{
		++min;
		++n;
	}
	return n * flag;
}

Date& Date::operator = (const Date& d)
{
	if (this != &d)
	{
		_year = d._year;
		_month = d._month;
		_day = d._day;
	}
	return *this;
}

ostream& operator<<(ostream& out, const Date& d)
{
	out << d._year << ' ' << d._month << ' ' << d._day << endl;
	return out;
}

istream& operator>>(istream& in, Date& d)
{
	in >> d._year >> d._month >> d._day;

	return in;
}